Pitting Enhanced Fatigue in 7075 Aluminium Alloy
Pitting corrosion of two tempers (T6 and T73) of 7075 Aluminium alloy were quantified by digital image processing. The effect of pitting corrosion on fatigue life in 7075 Aluminium alloy in two aging conditions was studied. Pitting was found to be slightly more severe for T6 tempers compared to T73 tempers for different time of exposures. The fatigue lives of two tempers of 7075 Aluminium alloy at high peak stresses were compared in the uncorroded and pre-corroded (pitted) states. Absolute fatigue lives of T73 samples were much higher than that of T6 in the uncorroded as well as pre-corroded condition. The various crack initiation methodologies observed through fractographic analysis is discussed.
Atsushi Suzuki and G. Sundararajan
S. Dey et al., "Pitting Enhanced Fatigue in 7075 Aluminium Alloy", Advanced Materials Research, Vol. 117, pp. 43-48, 2010